Could not start IPv6 router discovery

[haiku]

Hello,
I am stuck to get an IP using 4.1.5-1-ARCH #1 SMP PREEMPT Wed Aug 12 19:02:34 MDT 2015 armv7l GNU/Linux.
I had to restart systemd-networkd, what's wrong ?
$this->bbcode_second_pass_code('', '[root@rpi ~]# systemctl status systemd-networkd
* systemd-networkd.service - Network Service
Loaded: loaded (/usr/lib/systemd/system/systemd-networkd.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2015-08-30 12:50:11 CEST; 32min ago
Docs: man:systemd-networkd.service(8)
Main PID: 552 (systemd-network)
Status: "Processing requests..."
CGroup: /system.slice/systemd-networkd.service
`-552 /usr/lib/systemd/systemd-networkd

Aug 30 12:50:11 rpi systemd[1]: Starting Network Service...
Aug 30 12:50:11 rpi systemd-networkd[552]: Enumeration completed
Aug 30 12:50:11 rpi systemd[1]: Started Network Service.
Aug 30 12:50:11 rpi systemd-networkd[552]: eth0: Could not start IPv6 router discovery: Address family not supported by protocol

[root@rpi ~]# more /etc/systemd/network/eth0.network
[Match]
Name=eth0

[Network]
DHCP=yes
')
Thanks